9999100000 has 72 divisors (see below), whose sum is σ = 24605831376. Its totient is φ = 3999600000.

The previous prime is 9999099991. The next prime is 9999100009. The reversal of 9999100000 is 19999.

It is an interprime number because it is at equal distance from previous prime (9999099991) and next prime (9999100009).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999100009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50005 + ... + 149995.

It is an arithmetic number, because the mean of its divisors is an integer number (341747658).

Almost surely, 2^9999100000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9999100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12302915688).

9999100000 is an abundant number, since it is smaller than the sum of its proper divisors (14606731376).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9999100000 is an frugal number, since it uses more digits than its factorization.

9999100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100026 (or 99998 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 37.

The square root of 9999100000 is about 99995.4998987454. The cubic root of 9999100000 is about 2154.3700550521.

Adding to 9999100000 its reverse (19999), we get a palindrome (9999119999).

The spelling of 9999100000 in words is "nine billion, nine hundred ninety-nine million, one hundred thousand".